Emerg Infect DiseidEmerging Infectious Diseases1080-60401080-6059Centers for Disease Control89031962639807Research ArticleUnexplained deaths due to possibly infectious causes in the United States: defining the problem and designing surveillance and laboratory approaches. The Unexplained Deaths Working Group.PerkinsB. A.FloodJ. M.DanilaR.HolmanR. C.ReingoldA. L.KlugL. A.VirataM.CieslakP. R.ZakiS. R.PinnerR. W.KhabbazR. F.National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA.Jan-Mar1996214753